Make gate-hacking-pypy non-gating

gate-hacking-pypy Breaks with critical patch https://review.openstack.org/#/c/48345/
So unless we can get pypy working soon, make it non-voting.

Change-Id: I1052dc6480a08aaab42e2368473953990ac62d27
Merge "Make gate-hacking-pypy non-gating"